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Pressure limit for 7 RM???

 
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  #1  
Old 01-26-2007, 11:09 AM
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Join Date: Jun 2003
Location: Hermiston, Oregon
Posts: 2,005
Pressure limit for 7 RM???

I was doing a bit of load development yesterday with my 7 RM and 160g AB + H1000. I started at 68g and went to 69g then 70g. 68g showed pressure right off the bat and was going 2950fps or so. I went to 69g and same pressure, velocity didn't move to much. Accuracy was 2 in and 1 out for both loads. I didn't test 70g as I packed up and left cuz it was gettin real windy. Anyways I know 3000fps with 160g AB and H1000 is totally doable. According to Hodgons website, They list 70g as Maximum at 2900fps. I noticed the SAAMI pressure limits were around 51,000. As I was looking around at other cartridges, they were between 60-64000. I didn't know the 7 RM couldn't be loaded to higher pressures then that. Am I missing something here?? Could this be sometimes why the 7 RM doesn't get the achieved velocities?
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Old 01-26-2007, 01:24 PM
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Join Date: Nov 2004
Posts: 878
Re: Pressure limit for 7 RM???

check your incriments.... cup vs psi
Even after that, the older belted magnums are held to lower pressures than the new cartridges... and its perfectly safe, in a modern bolt action, to load to 64000psi. The real limiting factor is the brass, and ar what point it starts streaching.
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